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Method for comprehensively utilizing lignocellulose by using polyol-based acidic eutectic solvent

A technology of lignocellulose and deep eutectic solvent, which is applied in fermentation and other directions, can solve the problems of increased post-processing costs, etc., and achieve the effects of simple operation, improved enzymatic hydrolysis and saccharification efficiency, and obvious effects

Pending Publication Date: 2022-02-25
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The ternary DES system (ChCl / glycerol / AlCl) designed by Xia et al. based on the theory of acidic multi-site coordination 3 ·6H 2 O) Although the efficiency of lignin fractionation is increased to 95.46%, the introduction of metal ions cannot avoid the increase of post-treatment costs

Method used

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  • Method for comprehensively utilizing lignocellulose by using polyol-based acidic eutectic solvent
  • Method for comprehensively utilizing lignocellulose by using polyol-based acidic eutectic solvent
  • Method for comprehensively utilizing lignocellulose by using polyol-based acidic eutectic solvent

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Step (1): Crushing the moso bamboo raw material to a particle size of 60-80 meshes, extracting with a 2:1 toluene-ethanol solution, and drying at a constant temperature of 65°C.

[0031] Step (2): according to molar ratio polyol:choline chloride=2:1, gross mass is that 30g takes by weighing ethylene glycol / glycerol / xylitol / sorbitol respectively (respectively denoted as embodiment 1a, implementation Example 1b, Example 1c, Example 1d) and choline chloride were in a three-necked flask, reacted at 120° C. with a stirring speed of 150 rpm until a solution was formed and was clear and transparent, and then added 0.3 g of sulfuric acid (98%) to react for 10 min .

[0032] Step (3): Weigh 3.0 g of the raw material to remove the extract in step (1) and add it to the deep eutectic solvent system configured in step (2), and react at 120° C. with a stirring speed of 150-500 rpm for 3.0 h.

[0033] Step (4) Filter the mixture in step (3) under reduced pressure, wash with excess ab...

Embodiment 2

[0038] Step (1): Crushing the moso bamboo raw material to a particle size of 60-80 meshes, extracting with a 2:1 toluene-ethanol solution, and drying at a constant temperature of 65°C.

[0039] Step (2): Weigh 9.436g, 20.564g xylitol and choline chloride respectively in a three-necked flask, react at 100°C with a stirring speed of 150rpm, until a solution is formed and is clear, then add 0.3g of sulfuric acid (98 %) to react for 10 minutes.

[0040] Step (3): Weigh 3.0 g of the raw material to remove the extract from step (1) and add it to the deep eutectic solvent system configured in step (2), and react at 90° C. with a stirring speed of 150 rpm for 3.0 h.

[0041]Step (4): filter the mixture in step (3) under reduced pressure, wash with excess ethanol until the washing liquid is neutral, and collect the filtrate. The ethanol in the filtrate was removed by rotary evaporation, and then injected into ten times the volume of deionized water to obtain regenerated lignin.

[00...

Embodiment 3

[0046] Step (1): Crushing the moso bamboo raw material to a particle size of 60-80 meshes, extracting with a 2:1 toluene-ethanol solution, and drying at a constant temperature of 65°C.

[0047] Step (2): Weigh 9.436g, 20.564g xylitol and choline chloride respectively in a three-necked flask, react at 120°C with a stirring speed of 150rpm, until a solution is formed and is clear and transparent, then add 0.09g of sulfuric acid (98 %) to react for 10 minutes.

[0048] Step (3): Weigh 3.0 g of the raw material to remove the extract from step (1) and add it to the deep eutectic solvent system configured in step (2), and react at 120° C. with a stirring speed of 150 rpm for 3.0 h.

[0049] Step (4): filter the mixture in step (3) under reduced pressure, wash with excess ethanol until the washing liquid is neutral, and collect the filtrate. The ethanol in the filtrate was removed by rotary evaporation, and then injected into ten times the volume of deionized water to obtain regener...

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Abstract

The invention relates to the technical field of pretreatment of lignocellulose, and concretely relates to a method for improving the utilization value of lignocellulose through pretreatment of an acidic polyol eutectic solvent. The method mainly comprises the following steps: preparing a polyol-based acidic eutectic solvent, treating an extract-removed lignocellulose raw material, and hydrolyzing filter residues obtained by solid-liquid separation under the action of a cellulose compound enzyme so as to enhance the conversion efficiency of cellulose to glucose and improve the purity of glucose; and carrying out water precipitation regeneration and separation on a filtrate to obtain lignin, and recycling the residual filtrate in a new pretreatment process. According to the method, no metal catalyst is added in the technological process, wood fiber components can be rapidly dissociated through pretreatment, two components including lignin and cellulose are obtained, the cellulose serves as a conversion object, the enzymolysis saccharification efficiency is improved, the obtained glucose is high in purity, the follow-up purification cost is reduced, the solvent can be recycled, and the cost is low. The two major components of the wood fibers are separated and utilized through a green and environment-friendly method, and comprehensive utilization of the lignocellulose components is facilitated.

Description

technical field [0001] The invention belongs to the field of lignocellulosic biomass refining, and in particular relates to a method for improving the utilization rate of lignocellulose by pretreatment with an acidic polyalcohol deep eutectic solvent. Background technique [0002] Agricultural and forestry waste resources such as bamboo, straw, wood chips, and rice husks are low-cost and abundant biomass resources, which are expected to reduce the use of a larger proportion of non-renewable fossil energy. The development and utilization of woody biomass resources is an important way to alleviate the energy crisis, and the efficient separation and high-value utilization of lignocellulose components has attracted more and more attention from researchers. [0003] Lignocellulose contains carbohydrates (cellulose, hemicellulose) and lignin. Among them, carbohydrates can be hydrolyzed into fermentable monosaccharides under the action of enzymes, and then converted into bioethano...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P19/14C12P19/02C08H7/00
CPCC12P19/14C12P19/02C08H6/00C12P2201/00
Inventor 陈天影汪合银唐艳军
Owner ZHEJIANG SCI-TECH UNIV
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